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SEO Glossary > First Input Delay (FID)
First Input Delay (FID)
The First Input Delay (FID) is a Core Web Vitals metric that measures the time when the user starts interacting with a page to the time when the browser begins processing even handlers in response to that interaction. The interaction includes: click on a link, click on a button, or other custom control.
The breakdown as follows:
Good: 0-100 ms
Needs Improvement: 100-300 ms
Poor: 300 ms and longer
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Core Web Vitals